<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <script src="../libs/vue.js"></script>
  </head>
  <body>
    <div id="app">
      <h2>{{title}}</h2>
      <div>
        <p>展示留言</p>
        <div v-for="(item,index) in list" :key="index">
          {{index}}.{{item.title}}
          <p>
            <button v-on:click="list.splice(index,1)">删除</button>
            <button v-on:click="updataItem(item,index)">修改</button>
          </p>
        </div>
      </div>
      <hr />
      <div>
        <p>添加留言</p>
        <p>
          <input type="text" v-model="text" placeholder="请输入" />
          <button v-on:click="addList">提交留言</button>
        </p>
      </div>
    </div>
    <script>
      const vm = new Vue({
        el: "#app",
        data: {
          title: "Vue - 留言板",
          list: [
            {
              title: "原生js",
            },
            {
              title: "原型proto",
            },
            {
              title: "jquery",
            },
            {
              title: "ajax",
            },
          ],
          text: "",
        },
        methods: {
          addList() {
            this.text &&
              this.list.push({
                title: this.text,
              });
            this.text = "";
          },
          updataItem(item, index) {
            var title = window.prompt(index, item.title);
            console.log(title);
            if (title && title != item.title) {
              this.list.splice(index, 1, { title });
            }
          },
        },
      });
    </script>
  </body>
</html>
